Combination drafting implement.



J. E- BAILEY.

COMBINATION DRAFTING IMPLEMENT.

APPLICATION men mac. :2. 1912.

Patented May 18, 1915.

IIlIIIIIIlIllllIIIIlIIlI rHE NORRIS PETERS 60.. PHOTO LITHOH WASHINGTON,D. c

'JoIIIv n. BAILEY, or MILWAUKEE, WISCONSIN.

COMBINATION DRAFTING IMPLEMENT.

Specification of Letters Patent.

Fatented May 18, 1915.

Application filed December 12, 1912. Serial No. 736,373.

To all whom it may concern: 7 Be it known that I, JOHN E. BAILEY, asubject of the King of Great Britain, residing at Milwaukee, in thecounty of Milwaukee and State of Wisconsin, have invented newand usefulImprovements in Combination Drafting Implements, of which the followingis a specification.

This invention relates to drafting appliances and more particularly to acombination T-square and protractor and a means for mounting the sameupon a drawing board.

The primary object of thisinvention is to provide a convenient and novelmeans whereby a draftsman may compute the degree of an angle with greatrapidity, accuracy and convenience.

Another object of this invention is to combine a. protractor and aT-square by mounting the, protractor upon the T-square, and to provide astraight edge in connection with the protractor so that the draftman mayaccurately, as well as, easily, lay off any desired angle upon hispaper.

Another object is to slidably mount this combined T-square andprotractor upon the board so that at all times, the greatest ac curacymay be obtained in the drawing, besides always having the tools incloseproximity to the draftsman and in a convenient place.

Among many other objects of the device are: to provide one of themembers upon which the T-square is slidably mounted with graduations sothat in cases where absolute accuracy is not necessary, the use of anextra scale may be abandoned; the provision of novel and efficient capsor thumb nuts upon the various studs used in the device, which will,when the threads become slightly worn still cause a firm and trueconnection between the. cap and the stud; and also to provide a noveland eflicient means for mounting the. head of a T-square upon the bladeportion in a manner to prevent all possibility of splitting either thehead or the blade by the screws used in securing the tool.

With the foregoing and other objects in view, this invention consistsessentially in the provision of a' specially constructed T- squarehaving a protractor slidablyjmounted thereon, a straight edge connectedto the protractor indicator and both the straight edge and the indicatorpivotally mounted upon the protractor, a specially constructed boardhaving a T-square slidably mounted thereon and graduations upon one ofthe members upon which the T -square is mounted.

In describing the invention in detail, reference will be had to theaccompanying drawings wherein like characters designate like orcorresponding parts throughout the several views and in which Figure 1is a top'plan view of the entire device, showing some parts broken away.Fig. 2 is a sectional view onthe line 22 of Fig. 1.. Fig. 8 is asectional view on the line 3-3 of Fig.1, showing'the cap removed. Fig. 4is a sectional view on the line H of 1, and Fig. 5 is a detail view ofthe manner of mounting one end of the T-square on the supporting memberof the brackets for holding the square.

In the drawings, 1 denotes the blade of the T-square which has its edge2 beveled as is clearly shown at 3. T he other edge dis beveled a shortdistance inwardly as at 5 from where the projection 6 entends outwardly.The projection 6 has a straight edge 7. The end 8 of the T-square-blade1' is provided with a cut-out portion 9 in' which is seated the head 10of the T-square. In this instance, the head is an angled member having.the part 11 bent downwardly and at right angles to the part 12. The headlO' is securely held in the cut-out portion 9 by means of a plurality ofscrews 13, which have beveled heads 14. The beveled heads 1d of thescrews 13. are countersunk into the end of the blade 1. A metallic plate16, having a facial projection 17 upon its outer edge, is seated in arecess 18 in the blade 1 and the screw head 14 is seated in an openingin the plate 16. Mounting this small metallic plate 16 in the T-squareblade 1 prevents'the blade from splitting when the screws 13 areinserted therein. The angled end 11 of the T-square head 10 is providedwith an opening or hole 19 for the reception of the screw-threaded stud20. Thelstud 20 has a head portion 21 upon one end and this head 21 isslidably mounted in an opening in the square member 22. The member 22 isconnected by any suitable. means (not shown) to the edge 23 of thedrawing board 24;. The angled portion 11 of the T-square head 10slidably engages the outer side of the'member 22 and is held inengagement therewith by the spring 25 which is secured at its'ends 27and 28 to the T=square head 10 by means of screws 29 or any othersuitable fastening means. The spring 25 is bent,

as is clearly shown in F 1 of the draw-' ings, and the center portion 30whichis provided with an opening 31' for the reception isprovided withan opening 34 for the re- 7 ception of astud 35.

The stud 35 has a cylindricallyshaped head 36 which is pro- 'the, innerend thereof.

39 and the corrugations thereon provide a vided V with a longitudinallyextending opening 37 centrally located therein. A

thumb nut or cap 38 is screwed upon the stud 35 and has an annular ring39 which is' stud 35 and has an anular ring 39 which is provided withcorrugations, disposed near means for conveniently andsecurely grippingthe cap 38 when it is desired to turn the same. A washer 40 isinterposedbe? tween the. cap .38 and the T-square blade 1. A spring 41 is seatedin arecess 42 inthe cap. 38 and engages the inner wall 43 of the recess42. This ,spring 41' tends to keep the washer 40 in contact with theT-square. blade '1 and also when the threads get slightly worn on eitherthe cap 38or the stud 30 to keep a firm and secure connection between Itheftwo.

A hollow cylindrical 'member 43, pro:

1 vided with twoopenings 44 disposed digraduations and when it isdesiredone of rectly opposite, each other, forms a covering. or cap forthe head 36 of the stud 34. A tubular member 45 is mounted in brackets46, which brackets 46 are secured to the edge 47 of the board 24. Thebrackets 46 are provided with elongated slotsor-op'enings 48 for thereception of'thettubular member 45. Aiplug 49 is mounted in. each .endof the tubular member 45 anda cap or thumb nut 49, identicalinconstruction withthe cap 38 is screwed on the endthereof. The tubularmember 45 is furtherprovided: with graduations so that. in cases whereextreme accuracy is not necessary,

the use of a scale may be dispensed with. The member 22 is also providedwith the members 22 or 45 may beiprovided with graduations of the.metric system while the.

other has the graduations of] the English system of linearmeasurementthereonb Or these two members may be 17 graduated accordingto the discretion of either the manufacturer or: the purchaser.,Whileboth of r the, members 22 and 45.are herel shown pro is to'beundervided with 'graduations, it

This annular ring.

stood that the 'gr'aduations may be elimi- I nated from either or bothof them without the T-square blade 1 and hasits dial 51 graduated asshown at 53. The under surface of the protractor dial 51 is providedwith an extension 52 which is shaped so as to conform with the bevelededge 5 of the T-square blade 1 and to form a slidable connection betweenthe protractor 50 and the T-square blade 1. The outer side 53 of theprotractor dial 51 is bent downwardly at right angles to the mainportion of the same and'a plug 55 having one edge beveled so. as toconform with the angled edge 3 of the T-square blade 1' is mountedthereon. The plug 55 is provided with an opening 56 for the reception ofa stud 57 which has a cap or thumb nut 58 in threaded engagement to theouter end of the same. 6 e

A cap 58 is provided with arecess 59 in which a spring -60 is disposed.A washer 61 is interposed between the cap 58 and the protractor dial 51.6

An indicator. or pointer 62 is pivotally mounted upon the dial 51 bymeans of the stud63. This stud 63 extends through the,

protractor dial 51 andhas its'head 64 seat ed in a counterbore in thestraight-edge65.

A washer 66 is interposed between the straight-edge 65 andtherprotractor jdial51;

The indicator 62 and the straight5edge 65 are both rigidly connectedtof'the studs 62 so that when'one is moved,.the other-will movecorrespondingly.

A cap 67 which is provided with a recess 68 for its reception of aspring 69 is se-i cured upon the threaded end of thestud 63 and holdsthe several parts of the pros tractor, namely the indicator 62, the dial54, the washer 66 and the straight-edge 65 in engagement with'eachother. The cap 67, as are the caps'38, 59, and- 32, is-provided with anannular'projection 70, which annular projection 70-is provided.with'co'rrugations on its outeredge. This projection 70 and thecorrugations thereongreatly aid in gripping the'capwhen it is-desired toturn the same. A washer 71 is interposed between the cap 67 andindicator 62. H

r "A small knob 72 issecuredto the outer 2 end 73 of the straight-edge65and assists in manipulating the straight edge 65. v o It islthoug'htfrom theforegoing description and the drawings, the advantagespand'{novel features of. this. invention will be readily comprehended. I 1

V In practical fields, certain minor features of construction,combination and arrangement of parts, may necessitate alterations to,which the: patentee. is. entitledv provided such alterations'arecomprehended within thescope of what is claimed.

Having fully. described the invention,

what is claimed as new, useful and novel 1s: i

1. In a drafting implement, a board, guide members extending along twoopposite sides of said board, a T-square slidably mounted on said guidemembers, a fiat spring mounted upon the head ofsaid T- square, a stud,said stud being slidably engaged with one of said guide members andpassing through said spring, and a nut for engagement with said stud fortensioning said spring.

2. In a drafting implement, a board, guide members extending along twoopposite sides of said board, a T-square slidably mounted on said guidemembers, a spring mounted upon. the head of said T-square, said springhaving an opening formed therein, one of said guide members having aslot formed therein, a stud slidably arranged in said slot, said studextending through theopening in said spring,,and.a thumb nut threaded onsaid stud for regulating the tension of said spring.

Copies of this patent may be obtained for edge slidably guided by saidguide members, and means for holdingone end of said straight edge inadjusted position on one of said guides comprising, a thumb nut, a shafthaving a shank and an enlarged head which encompasses said guide, saidshank extending through said straight edge and adjustably seated in saidthumb nut, a washer interposed between said thumb nut and said straightedge and, a spring seated in a recess in said thumb nut about said shankand engaging said washer for forming a firm connection between thewasher and the straight edge and means for holding the other end of thestraight edge in engagement with the other of said guides.

JOHN E. BAILEY.

Witnesses:

ROBERT T. LAWSON, MATTIE Y. LAWSON.

five cents each, by addressing the Commissioner of Patents,

Washington, D. G.

